Answer:
App - It is an application, especially as downloaded by a user to a mobile device.
Achy - It is suffering from continuous dull pain.
Chap - It is a guy or a fellow. A boy or man who's a friend, acquaintance, or a friendly stranger.
Hazy - It is cover by a haze. Its vague, indistinct, or ill-defined.
Hay - It is grass that has been mown and dried for use as fodder.
Pacy - It is fast or quick moving.