theism vs monotheism

theism and monotheism both are nouns.

Word	Noun	Adjective	Verb	Adverb
theism	Yes	No	No	No
monotheism	Yes	No	No	No

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

Other hyponyms of theism include polytheism, pantheism, panentheism, pandeism, pantheism.

theism (noun)	monotheism (noun)
the doctrine or belief in the existence of a God or gods	belief in a single God