(a)
far, star, bar,...;
bazaar, Saar;
(b)
sharp, part, bark, arch, scarf, farce, harsh,
garb, card, large, carve, parse,
farm, barn, snarl, Charles,
party, market, marvellous,...;
heart, hearken, hearth;
sergeant;
aardvark;
(c)
sari, Bari, safari, cascara, curare, Mata Hari¹, aria¹, scenario¹, Sahara¹, tiara¹.
¹ GenAm also /ær ~ ɛr/.