But -- The Greek word translated as "but" means "but," "however," and "on the other hand." Since it always falls in the second position, translating it as "however" often captures its feeling better.

about -- The Greek word translated as "of" means "around" when referring to a place, but, in this context, it means "about," "concerning," "on account of," and "in regard to." This is the way Christ usually uses it.

that -- The word translated as "that" is an adjective that highlights its noun as being in a specific place or time from a word that means "there." This word appears after the word translated as "day."

missing "the"  -- (MW) The untranslated word  is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

day -- The Greek word translated as "day" also means "time," in general, and refers to a "specific time of life."

or -- (WW) The Greek word translated as "or" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

hour -- The word translated as "hour" means a period of time, generally, as we might say "moment."

no one,  - The Greek word translated as "no one" also means "no one" and other negatives nouns.

knows -- (WT) The word translated as "knows" means primarily "to see" and is used to mean "know' as we use the word "see" to mean "understand" in English in a phrase like "Do you see?" Its tense describes an action completed in the past, "has seen."

not -- (CW) "Not " is not the normal Greek negative. It is from a negative conjunction that means "but not" and as both parts of "neither...nor." The "neither-nor" is the sense here.  Jesus typically uses this word in the "neither...nor" construction, making the elimination of the "nor" phrase here difficult to explain. The "no, not" translation is also hard to explain because, appearing alone, this word is more like "but not."

even -- (IP) There is nothing that can be translated as "even" in the Greek source.

the -- The word translated as "the" is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

angels  -  (UW) "Angels" is from a noun meaning "messenger" and "envoys" though it became to mean "semi-divine beings" in later use from its use in the NT.

in --  (WW) This word "in "  comes from the genitive case of the following word that required the addition of a preposition in English.  The most common is the "of" of possession, but it can also mean "belonging to," "part of," "which is," "than" (in comparisons), or  "for," "concerning" or "about" with transitive verbs. 

missing "the"  -- (MW) The untranslated word is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

heaven, The word translated as "of heaven" means sky, the climate, and the universe. It also meant the home of the gods in a physical sense: the sun, moon, and planets were named for the gods. More about the word in this article.

nor  - "Nor" is from a negative conjunction that means "but not" and as both parts of "neither...nor." The "neither-nor" is the sense here.  Jesus typically uses this word in the "neither...nor" construction, making the elimination of the "nor" phrase here difficult to explain. The "no, not" translation is also hard to explain because, appearing alone, this word is more like "but not."

the -- The word translated as "the" is the Greek definite article, without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

Son, -- The word translated as "son" more generally means "child" or "children." It can refer to all offspring in later generations, just like "father" refers to all previous generations. Jesus also used it metaphorically to describe those who follow a way of thought or set of beliefs that descend from an individual. More about it in this article.

but - (WW) Two Greek words are translated as "except." Literally, they mean "if not" but this phrase is used to mean "except," "instead," and "but."   However, this is neither of the two common words more legitimately translated as "but" since Jesus uses this phrase to me "except."

only.  -  "Only" is monos, which means "alone," "solitary," "only," "single," and "unique."

the --  The word translated as "my" is the Greek definite article, "the," not the pronoun "my." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

Father "Father" is the common word that Christ uses to address his own Father, though it can mean any male ancestor. When referring to others, Christ uses it to refer to their ancestors, that is, "forefathers."