OXFORD DICTIONARY
adverb, n. a word or phrase that modifies or qualifies another word (esp. an adjective, verb, or other adverb) or a word-group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. (e.g. gently, quite, then, there).
adverbial adj.
F adverbe or L adverbium (as AD-, VERB)
THESAURUS
adverb
adjectival, adjective, adverbial, adversative conjunction, attributive, conjunction, conjunctive
adverb, coordinating conjunction, copulative, copulative conjunction, correlative conjunction, disjunctive, disjunctive conjunction, exclamatory noun, form class, form word, function class, gerundive, interjection, part of speech, participle, particle, past participle, perfect participle, preposition, present participle, subordinating conjunction, verbal adjective