Ache is a verb.
Ache is a noun and a verb. Noun: I have an ache is my side. Verb: My side aches.
Aching is an adjective.
The word 'noun' is not a verb. The word 'noun' is a noun, a word for a thing.
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
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.
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'.
My heart aches for you.
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.
Noun. Adjust is a verb.
It is neither a noun or a verb.