Of course, this is not strictly speaking true, but it does hold for a fair number of X. Leafing through the LSJ, I found ὁμοιο-βαρής "of like weight", ὁμοιο-γενής "of like kind", ὁμοιο-ειδής "having like appearance", ὁμοιο-μερής "having similar parts", ὁμοιο-παθής "having like feelings (or qualities)", ὁμοιο-πλατής "having like breadth", ὁμοιο-σκελής "with similar legs", ὁμοιο-ταχής "of like speed".If X-ος is a neuter s-stem, then ὁμοιο-X-ής is an adjective meaning "of like X" or "having X to a similar extent".
In other words, this points towards a mechanism that was productive at some stage. My question: Has this been documented somewhere? In particular, I would like to know what the expert opinion is on whether (and if so at which stage) this mechanism might have been productive. I have looked in some of my grammars, but none of them mentioned this specific pattern. I would like to find more about it, and would like to know where I can find similar phenomena documented.
Another case in point (admittedly more trivial): for denominative verbs in -άζω and -ίζω we often find derivative nouns in -ασμός and -ισμός. The semantic relation seems to be that the nouns express the action or (sometimes) the result of the verb. Again, it would be nice to have a reference to corroborate this.