endgame vs end game

endgame and end game both are nouns.

Word	Noun	Adjective	Verb	Adverb
endgame	Yes	No	No	No
end game	Yes	No	No	No

As nouns, endgame and end game are synonyms defined as:

endgame and end game: the final stages of a chess game after most of the pieces have been removed from the board

As nouns, endgame and end game are synonyms defined as:

endgame and end game: the final stages of an extended process of negotiation

endgame (noun)	end game (noun)
the final stages of a chess game after most of the pieces have been removed from the board	the final stages of a chess game after most of the pieces have been removed from the board
the final stages of an extended process of negotiation	the final stages of an extended process of negotiation