Question

Replace the nouns in italics by verbs "his purpose is not clear from his letter"

Answer 1

no noun is mentioned in italics how shall we answer

Answer 2

A noun refers to a word which functions in the name of some particular thing or a group of things, for examples, it could be anything from living creatures, objects, to places, actions, qualities, states of existence, or anything.

Also, a noun is a member of an, open part of speech whose members can occur as the main word in the subject.