doubt vs suspicion

doubt and suspicion both are nouns.

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

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

doubt (noun)	suspicion (noun)
uncertainty about the truth or factuality or existence of something	being of a suspicious nature
the state of being unsure of something	doubt about someone's honesty
	an impression that something might be the case
	the state of being suspected

doubt (verb)	suspicion (verb)
consider unlikely
lack confidence in