propose vs purport

propose is not a noun while purport is a noun.

Word	Noun	Adjective	Verb	Adverb
propose	No	No	Yes	No
purport	Yes	No	Yes	No

As verbs, propose and purport are synonyms defined as:

Other synonyms of propose include aim, purpose.

propose (noun)	purport (noun)
	the pervading meaning or tenor
	the intended meaning of a communication

propose (verb)	purport (verb)
present for consideration, examination, criticism, etc.	propose or intend
propose or intend	have the often specious appearance of being, intending, or claiming
make a proposal, declare a plan for something
ask (someone) to marry you
put forward; nominate for appointment to an office or for an honor or position