esthetician vs trained worker

esthetician and trained worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
esthetician	Yes	No	No	No
trained worker	Yes	No	No	No

As nouns, trained worker is a hypernym of esthetician; that is, trained worker is a word with a broader meaning than esthetician:

esthetician: a worker skilled in giving beauty treatments (manicures and facials etc.)
trained worker: a worker who has acquired special skills

Other hypernyms of esthetician include skilled worker, skilled workman.

esthetician (noun)	trained worker (noun)
a philosopher who specializes in the nature of beauty	a worker who has acquired special skills
a worker skilled in giving beauty treatments (manicures and facials etc.)