For Hom. -οω for -αω, see cross645.
c. All verbs in -αννυ_μι have futures in -ά (ς) ω, -ῶ. Thus, σκεδάννυ_μι (σκεδα-)
d. A very few verbs in -αζω have the contracted form. βιβάζω (βιβαδ-)
e. Verbs in -ιζω of more than two syllables drop ς and insert ε, thus making -ι (ς) έω, -ι (ς) έομαι, which contract to -ιῶ and -ιοῦμαι, as in the Doric future ( cross540).
So νομίζω (νομιδ-)
N.—Such forms in Attic texts as ἐλάσω, τελέσω, νομίσω, βιβάσω are erroneous.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].