propose vs request

propose is not a noun while request is a noun.

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

As verbs, request is a hypernym of propose; that is, request is a word with a broader meaning than propose:

propose (noun)	request (noun)
	the verbal act of requesting
	a formal message requesting something that is submitted to an authority

propose (verb)	request (verb)
present for consideration, examination, criticism, etc.	express the need or desire for
propose or intend	ask (a person) to do something
make a proposal, declare a plan for something	inquire for (information)
ask (someone) to marry you
put forward; nominate for appointment to an office or for an honor or position