1. A word used to modify the sense of a verb, participle, adjective, or another adverb.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• adiver,
• advers,
• advee,
• adverge,
• advart,
• adverce,
• addvert,
• advere,
• adoeb,
• advier,
• adverd,
• advser,
• adver,
• acserb,
• adverv,
• advern,
• advreb,
• andvair,
• anverz,
• Adwerd

• adversely,
• adverbial,
• advertize,
• adversary,
• advert,
• advertise,
• adverse,
• adversity,
• advertent.

The adjective form of the word "adverb" is "adverbial".

The plural of the "adverb" can be the "adverbs".

The singular of the "adverb" can be the "adverb".