Open English Wordnet
Nouns
(n)anteroom, antechamber, entrance hall, hall, foyer, lobby, vestibulea large entrance or reception room or area
(n)special interest, special-interest group, special interest group, advocacy group, lobby group, lobby, pressure group, third housean interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying
Verbs
(v)lobby, buttonholedetain in conversation by or as if by holding on to the outer garments of; as for political or economic favors