What It Scores
HA is a valid word in the tournament list this site uses. Tile values only, before any premium square: 5 in Scrabble and 5 in Words With Friends. The letters break down as H4 A1.
Anagrams of HA (1)
Same letters, different order. Any of these plays the same tiles for the same score.
Longer Words Containing HA
HA appears inside each of these, which is what makes it worth knowing as a hook.
ABTHANEABTHANESACALEPHAEACALEPHANACALEPHANSACANTHAACANTHAEACANTHASACEPHALICACEPHALOUSACHAENIAACHAENIUMACHAENIUMSACHAGEACHAGESACHALASIAACHALASIASACHARACHARNEACHARSACHARYAACHARYASACHATESACRONYCHALADHANADHANSADHARMAADHARMASAEROPHAGIAAEROPHAGYAFGHANAFGHANIAFGHANISAFGHANSAFOREHANDAFTERSHAFTAFTERSHAVEAGHAAGHASAGHAST
Next: the Word Unscrambler for any letters at all, and the two and three letter lists. Full entry and definition at Merriam-Webster.