A five letter word with the fourth letter A are:
aura, bola, coda, Dora, Ezra, flea, gala, Hera, iota, Jana, Kara, Lara, Mona, Okra, pita, plea, rhea, soda, stoa, skua, tuna, Ulla, Vera, wa-wa, ya-ya, Zaza
faster
bakerybikingbakinghikingjokinglikingmakingpokingrakingtakingwaking
Tactic.
physic
billet billet
Cougar
Skiing
Upkeep
caused, eluded, prudes
raCisM racism
saddlesettlesallowcheesecattlecuddleladdielassieladderletterbattleballadbatterbannerbetterbuttermattermiddlemellowmutterpatterpaddleputterpillowpelletpalletpuddletallowtellerhappenhollowfellowfollowfallowfillerfitterfatterkettlekittengutter
The word is picnic.