Synonyms for Six:

n.

crore, five, eighteen, eighty, eleven, fifteen, eight, fifty, cardinal number, billion. •six (noun)
half dozen, half a dozen, hexad, cardinal, sextuplet, sise, 6, sixer, captain hicks, sestet, vi, sextet.
•six of something (noun)
hexad, sextet, sextuplet.

Other synonyms:

•VI
vi.
•Other relevant words:
crore, five, eighteen, eighty, eleven, fifteen, eight, fifty, cardinal number, billion.