What do alien and its synonyms mean?

Aliens; Foreigners; Alien

Foreign; Strange; unlikeness

Discrimination of synonyms:

Foreigners, foreigners

Alien is similar to foreign in expressing "foreign land", but it is more formal and less common than foreign.

Alien, as an adjective, basically means "foreign, foreigner's" and can be used as a metaphor to mean "unfamiliar", which is mainly used as an attribute in sentences; Alien is extended to "different in nature", which often means "disgust and hatred" and is mainly used as a predicative in sentences.

(noun)

Foreigners, foreigners, immigrants, foreigners

Stranger, stranger.

Foreigners, foreigners

immigrant

Foreign languages are the official languages, laws and official documents.