It is a verb. As in "I lack the talent to be a pro ball player."
The noun form for the adjective deficient is deficiency.
Deficient is an adjective.
Adjective. It would describe a noun.
deficiency
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
what part of speech is eleven
Unsufficient isn't a word. However, insufficient is a word. It's an adjective.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The word "scarce" can function as both an adjective and an adverb. As an adjective, it describes something that is in short supply or insufficient. As an adverb, it modifies a verb and means not often or rarely.
the part of speech sashay is a averb
Did is a verb, and not is an adverb. Didn't is not any part of speech. It's a contraction of did and not.
Adjective
The word speech is a noun.
No, but it's part of a noun which the noun is the part of speech.