theorize vs construct

theorize is not a noun while construct is a noun.

Word	Noun	Adjective	Verb	Adverb
theorize	No	No	Yes	No
construct	Yes	No	Yes	No

As verbs, construct is a hyponym of theorize; that is, construct is a word with a more specific, narrower meaning than theorize:

Other hyponyms of theorize include reconstruct, retrace, develop, explicate, formulate.

theorize (noun)	construct (noun)
	an abstract or general idea inferred or derived from specific instances

theorize (verb)	construct (verb)
to believe especially on uncertain or tentative grounds	reassemble mentally
form or construct theories	draw with suitable instruments and under specified conditions
construct a theory about	make by combining materials and parts
	put together out of artificial or natural components or parts
	create by organizing and linking ideas, arguments, or concepts
	create by linking linguistic units