dia daoibh 'chuile dhuine.

I was practicing the decelnsions and came across the noun comhaontú I wanted to put it in the gen (sing.) and following the rules, ends in a vowel, came to the conclusion that it is probably a masc noun of the fourth decelnsion so it should be something like deireadh an chomaontú but when I looked it up it was indeed masc (however, it didn't specify a case) and the gen sing was an chomhaontaithe now I know there are always exceptions to rules but i just wanted to make sure if this was one or am i missing out on a rule that would help me identify its case?

GRMA

also while I'm on the subject of the gen. talamh shows two versions for the gen sing. an talaimh and na talún. Just variants?

comhaontú is the verbal noun of the verb comhaontaigh = unite.

Verbal nouns in -ú become always -aithe in genitive and -uithe in plural

Yep, both variants, and both accepted in the CO.

When the neuter fell out of Irish, c. 10 century onwards, it led to confusion regarding the gender of Old neuter nouns. Some were incorporated as feminine nouns, especially those of the n-stem, because their palatal inflection often mirrored the inflection of the á-stems (our present day first declension) in the acc. and dative. Some neuters became fully masculine and others could take either gender; often regional differences in the gender treatment of Old neuter nouns grew out of this development (most of these variants aren't accepted in the CO).

Talamh is one of those that can take either gender.

Regional/ dialectal differences in gender:

Ainm is fem. in Munster while being masculine in most other dialects.

Sliabh is fem. in Ulster (I think), though masculine in most other dialects.

Cian

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'maith agaibh lads. an-chuidiúil mar is gnáth