There are just a few irregular neutral nouns ending in -ος  like masculine nouns.

One has to memorize which nouns belong to this group. Τhe most common are:

το δάσος(forest),το βάρος(weight),το τέλος(end), το λάθος(wrong),το πλήθος(crowd), το έθνος(nation),το κέρδος(profit/benefit),το θάρρος(courage),το κράτος(state),το ύψος(height), το έδαφος(ground),το μέγεθος (size)

These irregular neutral nouns make the plural in – η

Examples

 το δάσος (forest)-   τα δάση (forests)

το κράτος (state)- τα κράτη (states)

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