supposed vs hypothetical

supposed is not a noun while hypothetical is a noun.

Word	Noun	Adjective	Verb	Adverb
supposed	No	Yes	No	No
hypothetical	Yes	Yes	No	No

As adjectives, supposed and hypothetical are synonyms defined as:

supposed and hypothetical: based primarily on surmise rather than adequate evidence

Other synonyms of supposed include conjectural, divinatory, hypothetic, suppositional, suppositious, supposititious.

supposed (noun)	hypothetical (noun)
	a hypothetical possibility, circumstance, statement, proposal, situation, etc.

supposed (adjective)	hypothetical (adjective)
required or under orders	based primarily on surmise rather than adequate evidence
doubtful or suspect
based primarily on surmise rather than adequate evidence
mistakenly believed