anteroom vs lobby

anteroom and lobby both are nouns.

Word	Noun	Adjective	Verb	Adverb
anteroom	Yes	No	No	No
lobby	Yes	No	Yes	No

As nouns, anteroom and lobby are synonyms defined as:

Other synonyms of anteroom include antechamber, entrance hall, foyer, hall, vestibule.

anteroom (noun)	lobby (noun)
a large entrance or reception room or area	a large entrance or reception room or area
	an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying
	the people who support some common cause or business or principle or sectional interest

anteroom (verb)	lobby (verb)
	detain in conversation by or as if by holding on to the outer garments of; as for political or economic favors