think of vs esteem

think of is not a noun while esteem is a noun.

Word	Noun	Adjective	Verb	Adverb
think of	No	No	Yes	No
esteem	Yes	No	Yes	No

As verbs, think of and esteem are synonyms defined as:

Other synonyms of think of include be known as, know as, look on, look upon, regard as, repute, take to be.

think of (noun)	esteem (noun)
	an attitude of admiration or esteem
	a feeling of delighted approval and liking
	the condition of being honored (esteemed or respected or well regarded)

think of (verb)	esteem (verb)
keep in mind for attention or consideration	look on as or consider
look on as or consider	regard highly; think much of
intend to refer to
take into consideration, have in view
choose in one's mind
devise or invent