[dhosek]

After a bit of thought, I did think of submerge, submarine, and any other subm- words

[mkl]

Also "entombment", "webmaster", and variations of them. But not many; /usr/share/dict/words on my system lists only 45, many of which are minor variations of each other.

[thaumasiotes]

> Also "entombment", "webmaster", and variations of them.

"Entombment" is spelled with -bm-, but the b is not pronounced. (As is also true of the root word "tomb".)

[mkl]

Yes, but spelling is what we're talking about, and in particular spelling in sign language, so pronunciation is irrelevant.

[thaumasiotes]

Well, I had shifted into pronunciation (mostly because in writing the concept of a "syllable" doesn't exist), but in the larger context, yes, that's fair.