Frontier rhymes with:
charpentier, volunteer, charpentier, minteer, volunteer, austere, budgeteer, charpentier, crochetiere, marketeer, mateer, mcteer, minteer, pamphleteer, pelletier, profiteer, racketeer, stear, steer, steere, summiteer, teer, volunteer
Frontier sounds like:
frontera, frontiere, furniture