Shipmate rhymes with:
acclimate, amalgamate, automate, breakmate, checkmate, classmate, decimate, dichromate, glucosamate, glutamate, inmate, multimate, overestimate, papermate, phonemate, playmate, primate, roommate, schoolmate, shoemate, shumate, stalemate, teammate, underestimate, unimate
Shipmate sounds like:
savant, seventh, seventieth, seventy, shipment, siphoned, spanned, spawned, spend, spent, submit, submitted, subpoenaed, suspend, suspended