αγχώ/αγχo I don't find as a substantiveThere are possibly a couple of hundred! From αγχώδης to χυμώδης including ενστικτώδης, ομιχλώδης, and τερατώδης. Too many to count. I have to confess... I have Collins Greek - English dictionary on my mobile and you can search with a wild card at the front!!
That's the way to search indeed.
Looks like searching for *ώδης in the parallel search only finds entries in the Kriaras dictionary, because in ΛΚΝ the headwords of such words also include -ης -ες (e.g. αγχώδης -ης -ες). If you want to find those entries in the parallel search, you need to search for "*ώδης -ης -ες", which returns 144 results.
Absolutely but I'm not going to control which have the exact same substantive + δη, which was my first idea.