Answer: Coffee is the adjective and mornings is the adverb
Step-by-step explanation:
Adverbs are a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. adjectives are a word or phrase naming an attribute, added to or grammatically related to a noun to modify or describe it.