Word: 

Words and phrases that rhyme with protostar:  (7 results)
2 syllables:
coast are, costar, co star, mostar, most are, o star, tostar
Words and phrases that almost rhyme †:  (14 results)
2 syllables:
boaster, coaster, poster, roaster, throwster, toaster
3 syllables:
holdover, homeowner, bill poster, zoroaster
4 syllables:
paternoster, roller coaster
6 syllables:
oven stuffer roaster, theatrical poster
More ideas:
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— Adjectives for protostar: central, massive, mass, young, single, nearby, spherical, embedded, type
— People also search for: galaxies, neutron star, planetary nebula, nebula, quasar, interstellar medium, supernovae, nucleosynthesis, eclipsing binary, milky way galaxy, chondrules, more...
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