customaricize
The verb form related to "customary" is "custom." While "custom" itself is primarily a noun, it can be used in a verb form as "to custom," meaning to make or adapt something in accordance with established practices or habits. However, this usage is quite rare, and "customary" is mainly used as an adjective to describe something that is traditional or normal in a particular context.
adjective
This related link will give you a full definition of a customary fee
No, it is a noun or a verb. Related adjectives are those for the related verb to mount, rather than the verb to amount.
This related link will give you a full definition of a customary fee
Yes.
There is not verb form for the noun 'craftsmanship'. A related verb is to craft.
No, it is an adjective. It is related to the nouns resident and residence, and the verb "to reside."
The verb related to the noun 'nutrition' is to nourish.
To weaken is a verb related to the word weak.
No, it is a noun. It is related to the verb "to anticipate."
Shaking can be a verb as part of a continuous structure (They are shaking hands) or it can be a gerund which is rather a noun (Shaking hands is not customary in Japan.)