Herbert Weir Smyth, A Greek Grammar for Colleges

The result or effect of an action is expressed by the primary suffixes

1. ες (nom. -ος, neut.): γέν-ος race, family, stem γεν-εσ- (γί-γν-ομαι am born, ἐ-γεν-όμην, γεν-), τέκ-ος child, stem τεκ-εσ- (τίκτω bring forth, τεκ-), ψεῦδ-ος lie, stem ψευδ-εσ- (ψεύδ-ω deceive).

2. ματ (nom. -μα, neut.): γράμ-μα thing written (γράφ-ω write), νόη-μα thought (νοέω think), ποίη-μα poem (ποιέ-ω make), δέρ-μα hide (δέρ-ω flay), τμῆ-μα section (τέμ-νω cut, τεμ-, τμη-, 128 a).