I can tell that is an alien space ship.
"The first contact with the alien was disconcerting." "The ways of foreigners are alien to us."
In the movie "Enemy Mine" the costar was an alien with reptilian features.
An alien ran down the street.
I am not writing a sentence using that word.
A translunar visitor is called an alien.
I can give you a sentence using the word galaxy.
a sentence using the word endotracheal
This is a sentence using the word aviator.
Exotic; foreign
The Aliens are in my house Messing up my things!!!
I am saying a sentence using the word collagen.
This is a sentence using the word monomer. :P