both.
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Depending on the use. A knuckle on a hand, or on a lobster is a noun, as it is a tangible object, (a person place or thing).
TO knuckle something, is in my opinion slang, but has knuckle used as a verb.
General rule of thumb, if you can say "TO _____" where _____ is the word in question, and it makes sense, it is most likely a verb. If you can touch it, talk to it, or go to it, it is probably a noun.
The noun 'is' is a verb, a form of the verb 'to be'. The verb 'is' functions as an auxiliary verb and a linking verb.
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
noun
A roar is a noun. To roar is a verb.
Training is a noun and a verb. Noun: e.g. activity of acquiring skills. Verb: present participle of the verb 'train'.
Has is a verb; it is not a noun. It is the third person singular of the verb to have. It functions as a helping verb as well, but it is not a noun.
is wrap a noun or verb
It is neither a noun or a verb.
Noun. Photosynthesizing is a verb.
Is plan a noun or verb
Noun. Adjust is a verb.
The word 'noun' is not a verb. The word 'noun' is a noun, a word for a thing.