A five letter word with the fourth letter A are:
faster
bakerybikingbakinghikingjokinglikingmakingpokingrakingtakingwaking
saddlesettlesallowcheesecattlecuddleladdielassieladderletterbattleballadbatterbannerbetterbuttermattermiddlemellowmutterpatterpaddleputterpillowpelletpalletpuddletallowtellerhappenhollowfellowfollowfallowfillerfitterfatterkettlekittengutter
Tactic.
physic
Cougar
Skiing
A 6-letter word with the letter "w" as the third letter is "answer." The word "answer" has six letters and the letter "w" appears in the third position, making it a suitable answer to your question.
Upkeep
caused, eluded, prudes
raCisM racism
The word is picnic.