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The New Pali Course Part III (1950)
Prof. A. P. Buddhadatta Maha Nayaka Thera

Chapter II Denominative Verbs

61. These are formed from the noun-stems by means of certain suffixes. The suffixes used to form the Denominative bases are aaya and iiya.

Formed with aaya:

pabbata + aaya + ti = pabbataayati, acts like a mountain, i.e. becomes steadfast
macchara + aaya + ti = maccharaayati, becomes selfish or acts avariciously
dolaa + aaya + ti = dolaayati, acts like a palanquin, i.e. wavers or swings
mettaa + aaya + ti = mettaayati, diffuses love or becomes benevolent
karu.naa + aaya + ti = karu.naayati, becomes compassionate, feels pity
dhuuma + aaya + ti = dhuumaayati, appears like smoke or emits smoke
timira + aaya + ti = timiraayati, appears like darkness or darkens
sa.m + dhuupa + aaya + ti = sandhuupaayati, fumigates or emits smoke

Dhuumaayitatta.m (clouding over or obscuration) and timiraayitatta.m (gloom, darkness) are two nouns from these bases; some others may be formed.

Formed with iiya:

putta + iiya + ti = puttiiyati, treats (some outsider) as one's own son

ref: http://www.tipitaka.net/pali/synthesis/pali3.00.cdv

(to be continued...)