common room vs front room

common room and front room both are nouns.

Word	Noun	Adjective	Verb	Adverb
common room	Yes	No	No	No
front room	Yes	No	No	No

As nouns, front room is a hypernym of common room; that is, front room is a word with a broader meaning than common room:

common room: a sitting room (usually at school or university)
front room: a room in a private house or establishment where people can sit and talk and relax

Other hypernyms of common room include living-room, living room, parlor, parlour, sitting room.

common room (noun)	front room (noun)
a sitting room (usually at school or university)	a room in a private house or establishment where people can sit and talk and relax