Adverbs or adjective ?

Adjectives describe nouns and pronouns. Adverbs do not. Adverbs describe verbs, adjectives, and other adverbs. Adjectives do not.

e.g : - Helen has a yearly membership at the local health club. ( Yearly is an adjective since it modifies the noun membership and tells which membership.)

- Helen contributes yearly . ( Yearly is an adverb since it modifies the verb contributes and answers the question, When does Helen contribute ?)

-Mike arrived late . -The late delivery cut down on sales in the supermarket.

→ Other words that can be used either as adjs or adverbs are : hard, fast, deep, early, near, far, high, little, few, much, many, loud, low, overhead, underground, ...