Synonyms for Neanderthal:

n.

Neanderthal (noun)
unrefined, swinish, neandertal, boorish, Neanderthal Man, loutish, Neandertal Man, oafish, neanderthalian, Homo Sapiens Neanderthalensis.
clown, fool, dumb blond, lump, numpty, joker, airhead, maniac. the Dreamtime, the Cretaceous, era, ammonite, fossilize, caveman, fossil, Cro-Magnon man, fossilized, carboniferous. bore, fogey, drip, diehard, dweeb, Drongo, conservative, dinosaur, anorak.

Other synonyms:

Neandertal
neandertal.
Neandertal man
Neandertal Man.
Neanderthalian
neanderthalian.
Neanderthal man
Neanderthal Man.
homo sapiens neanderthalensis
Homo Sapiens Neanderthalensis.
Other relevant words:
clown, lump, fool.