notion vs suspicion

notion and suspicion both are nouns.

Word	Noun	Adjective	Verb	Adverb
notion	Yes	No	No	No
suspicion	Yes	No	No	No

As nouns, suspicion is a hyponym of notion; that is, suspicion is a word with a more specific, narrower meaning than notion:

Other hyponyms of notion include presence, effect, first blush, hunch, intuition.

notion (noun)	suspicion (noun)
(usually plural) small personal articles or clothing or sewing items	being of a suspicious nature
a general inclusive concept	doubt about someone's honesty
an odd or fanciful or capricious idea	an impression that something might be the case
a vague idea in which some confidence is placed	the state of being suspected