Emigrant, immigrant, migrant

[ROBINDESBOIS]

I know the meaning of this 3 words and that if I say migrant it can be immigrant and emigrant, they are semantically interrelated but what category of words are they?
Synonyms
plesionyms
hoponyms
Thanks

[Rusty]

'Migrant' is the basic word here.

Hyponyms of migrant:
immigrant
emigrant