There were so many alternatives with the unused letters eg W, H, M, F, B that I had visions of running out of turns guessing for the remaining letter - that I decided to get a take on WHM in a single turn
Funny thing: for my third word I was looking for "thump" but my brain wouldn't produce it so I went with "thunk" instead, thinking I it didn't matter for an information gathering word and both are such stupid words I'd be annoyed if it was right anyway.