Thanks, yes they are nouns but I would like to know how to change the verb jeść into a noun jedzenie, what is the rule?
I found another verb also, spaść that that I would like to turn into a noun. Hopefully the rule will be similiar to jeść to jedzenie.
catsoldier - the irregularity comes from the history of the language (i.e. it is an etymological one)
jeść come from a verb root that looked like ed- (you see the root in edible which is a Latin loanword into English and equally is to eat a developement of the 'ed' verb root)
j is called a prosthetic consonant here (early Slavs didn't like ther words to start with 'e' for some reason)
so you got (j)ed-ti (that experienced contractions) - the form with -edz - is still retained in conjugation forms Oni jedzą. Oni jedli.