interstellar

between the stars

(inter means "between")

stellar

having to do with stars

aster

a star shaped flower

asterisk

a small star shaped mark

(isk means something "small")

astronomy

the study of beyond the earth's atmosphere

disaster

a terrible event

(dis means caused by an unfavorable star)

anthropologist

someone who studies human culture

(anthropo means "human")

dentist

an expert at caring for teeth

(dent means "teeth")

egotist

A person who is too focused on themselves

(ego means "I")

illusionist

a person who makes things appear real that are not

medalist

a person who excels and wins a medal as a prize

realist

a person who believes in what is real and practical