These user-created lists contain the word ‘cinerescent’.
List of adjectives such as everduring that do not frequent common speech and writing. A continuation of my list Adjectival Arcana, which had grown to over 7700 words and had become far too cumbersome.
transpontine, fetichistic, everduring, tachygraphic, tachygraphical, holographic, holographical, spectrobolographic, autographic, chirographal, autographal, ipsographic and 1419 more...
The little phrases that signify that your words might not necessarily say exactly what you want to express.
sort of, kind of, as it were, if i may so speak, tanquam, if i may so say, if i may be so bold, if i may use the ..., as ’twere, with respect, if i might add, and so forth and 46 more...
Words about fire.
flammability, ignescent, conflagration, incendiary, firestorm, combustibility, flashover, crown fire, incinerate, flash point, inferno, smoldering and 9 more...
Words designated rare (but not obsolete) in the OED.
accusatrix, adherescent, armipotence, aquose, arabicism, ardentness, arcifinious, arcuate, arenosity, armillated, artificer, artolater and 88 more...
brontide, petrichor, fremescent, clangor, cinerescent, thunderpeal, fulgurous