"Guy" and "man" have different connotations with adjectival nouns. Like "tree guy" = arborist but "tree man" = he lives in a tree, or maybe he is a tree.
"I know a guy" = "I have a useful contact."
"I know a man" = "I am about to tell you a story."
âHeâs a great guyâ = he is pleasant and fun and well-intentioned
âHeâs a great manâ = he has saved countless lives and changed the world irrevocably


















