No, not a noun, not a verb. The word 'efficient' is an adjective, a word that describes a noun.
The noun form for the adjective efficient is efficiency.
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A technology (noun) There is no verb form.
Manufacture can be used as a verb and a noun. There is also the gerund manufacturing.
No, the word 'tighten' is not a noun. The word 'tighten' is a verb, a word for an action.The noun forms of the verb to tighten are tightener (a concrete noun as a word for a physical device) and the gerund, tightening (a concrete noun as a word for a physical act).
Yes, the word "devise" can be used as both a noun and a verb.
The noun forms for the verb to replace are replacement and the gerund, replacing.