learner vs tyro

learner and tyro both are nouns.

Word	Noun	Adjective	Verb	Adverb
learner	Yes	No	No	No
tyro	Yes	No	No	No

As nouns, tyro is a hypernym of learner; that is, tyro is a word with a broader meaning than learner:

Other hypernyms of learner include beginner, initiate, novice, tiro.

learner (noun)	tyro (noun)
someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs	someone new to a field or activity
works for an expert to learn a trade