tourism vs ecotourism

tourism and ecotourism both are nouns.

Word	Noun	Adjective	Verb	Adverb
tourism	Yes	No	No	No
ecotourism	Yes	No	No	No

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

tourism: the business of providing services to tourists
ecotourism: tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature

tourism (noun)	ecotourism (noun)
the business of providing services to tourists	tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature