Nouns to verbs

[Tilly2]

This is not really a crossword question but it seems to be the best place to ask it.

When doing the Guardian prize crossword on Saturday, I was stuck on this clue It sitcks out of rolled gold pipe stuck into strut The answer was protuberance.

My question is, how does the verb protude become the noun protuberance?
Why the change from 'd' to 'b'? Why isn't it protuderance?

Are there an more examples of this kind of change?
Next question, why did my italics not work?

[cathfromsaron]

adsorb and absorbtion might be another!

[dannyk13]

Correct spelling of protude is protRude= to project etc. protuberance = swelling out etc. So in fact the two words are not part of each other.

[Tilly2]

That's a good one, cath. Not one I would have thought of.

[cathfromsaron]

hope i've got them the right way round now! lol!

[dannyk13]

A check in the dictionary would reveal that adsorb and absorb have different meanings

[cathfromsaron]

http://wiki.answers.c...sorption_and_sorption

yes mine was a boo boo!

[Tilly2]

Thanks for pointing out my typo with protrude, danny.
In my dictionary, protrude and protuberance have bulge as a definition (amongst others)
I see what you mean about them not being part of each other.