GOON-doolk
If you know IPA [ gʊndulk ]

kun- is the general or neuter noun class prefix as you already know.
-dulk is the noun stem which is in the class of incorporable nouns (i.e. those nouns that can be incorporated into verbs).

Some people also use the word kun-dulk to refer to a coffin (and the deceased therein). Some other people use the word kun-kod 'paperbark' for the same thing. The primary meaning however of kundulk is for trees, wood, sticks.

An-binik makka an-konomkuyeng kun-dulk kore kuwarddewardde.
'The Allosyncarpia ternata tree is a very tall tree from the rock country.'

(note this sentence is in the Kundedjnjenghmi and Kundjeyhmi dialects which use an- prefix instead of man- for the vegetal class. Either an- or man- in this sentence would be perfectly acceptable. Hyphens are used only to indicate noun class prefix breaks. The ku- on ku-warddewardde means 'at' or 'in' and is what linguists call a locative prefix, therefore 'in the rock country').

Nga-dulkbakke 'I'll break a stick'

Here the stem -dulk is incorporated into the verb -bakke to break. The pronoun prefix nga- is the first person singular 'I'.