A phirst grader's class assignment -- phind words with "ch" in the middle. Some we phound:

Archery
Anchovy
Parchment
Sachem

I offered "inchoate" but there was much protesting. Any others, less controversial?

PS: No compound phorms like "inched"

I suppose the "ch" isn't in the middle of peachy.

Leacherous (might not be that appropriate, though!)

Treacherous

Ocherous

Bletcherous

........ache .........

Excellent!

It's a great pleasure to be able to tap into the collective talent here.

purchase

can you use the soft ch sound or the ch that sounds like k?

cache
dichotomy
technology
cachet
archeology
architecture
bronchial
raunchy
poncho

all the words with "tch" in them: hatchery, witchcraft/stitchcraft

and let's not forget "machine", -ery, machination

and

saccharine
lecher
lichee nut (and Maraschino cherries)
vichysoisse
mocha
Munchausen
Pinochet

plus a bunch of words related to the Italian:
gnocchi, Ponchieli, Pinocchio...

Achoo! (and that's nothing to sneeze at!)

brochure
bacchanal - I suppose this won't count since it doesn't have the "ch" sound.
butcher
dutchess
machiavelian
rapprochement
ricochet

Tinman

Archaic arachnids, said Archibald archly.

How about autochthonous? But I guess you want it pronounced /tS/ not /x/ ~ /k/.