aliyah vs immigration

aliyah and immigration both are nouns.

Word	Noun	Adjective	Verb	Adverb
aliyah	Yes	No	No	No
immigration	Yes	No	No	No

As nouns, immigration is a hypernym of aliyah; that is, immigration is a word with a broader meaning than aliyah:

aliyah: (Judaism) immigration of Jews to Israel
immigration: migration into a place (especially migration to a country of which you are not a native in order to settle there)

Other hypernyms of aliyah include in-migration.

aliyah (noun)	immigration (noun)
(Judaism) immigration of Jews to Israel	migration into a place (especially migration to a country of which you are not a native in order to settle there)
(Judaism) the honor of being called up to the reading desk in the synagogue to read from the Torah	the body of immigrants arriving during a specified interval