Yes.
The adjective forms for the verb to act are active, acting, and acted.
Exploit is a verb, because it means a bold noble act. a bold noble act is an action so it is a verb. So yes it is a verb.
The verb forms are access, accesses, accessing, accessed. The verb access is an action verb (a verb for an act).
No
Yes, the verb 'to cower' is an action verb; a word for the act of cowering.
Yes, the verb to shriek is an action verb, a word for the act of shrieking.
Yes, the verb 'arrives' is an action verb, a word for the act of arriving.
The verb is 'act' (acts, acting, acted).
'Act' is a noun, such as an act of congress or the second act of a play. The noun "action" is formed from the verb 'to act'. Other nouns come from act, also: Activation, inaction, deactivation, reaction, reactivation, etc.
"It" is not a linking verb. "It" is a pronoun.
acted
Scare