Etymology
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Words related to -cy

-ia 
word-forming element in names of countries, diseases, and flowers, from Latin and Greek -ia, noun ending, in Greek especially used in forming abstract nouns (typically of feminine gender); see -a (1). The classical suffix in its usual evolution (via French -ie) comes to Modern English as -y (as in familia/family, also -logy, -graphy). Compare -cy.

In paraphernalia, Mammalia, regalia, etc. it represents Latin or Greek -a (see -a (2)), plural suffix of nouns in -ium (Latin) or -ion (Greek), with formative or euphonic -i-.
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-ship 

word-forming element meaning "quality, condition; act, power, skill; office, position; relation between," Middle English -schipe, from Old English -sciepe, Anglian -scip "state, condition of being," from Proto-Germanic *-skepi- (cognates: Old Norse -skapr, Danish -skab, Old Frisian -skip, Dutch -schap, German -schaft), from *skap- "to create, ordain, appoint," from PIE root *(s)kep-, forming words meaning "to cut, scrape, hack" (see shape (v.)). It often forms abstracts to go with corresponding concretes (friend/friendship, etc.).

-hood 
word-forming element meaning "state or condition of being," from Old English -had "condition, quality, position" (as in cildhad "childhood," preosthad "priesthood," werhad "manhood"), cognate with German -heit/-keit, Dutch -heid, Old Frisian and Old Saxon -hed, all from Proto-Germanic *haidus "manner, quality," literally "bright appearance," from PIE (s)kai- (1) "bright, shining" (Cognates: Sanskrit ketu "brightness, appearance"). Originally a free-standing word (see hade); in Modern English it survives only in this suffix.
absorbency (n.)
Origin and meaning of absorbency
"quality of absorbing," 1781, from absorbent + abstract noun suffix -cy.
accountancy (n.)
"the art of the accountant," 1848, from accountant + abstract noun suffix -cy. Accountantship is attested by 1818.
accuracy (n.)
"state of being extremely precise or exact; conformity to truth," 1660s, from accurate + abstract noun suffix -cy.
adequacy (n.)
1794; see adequate + abstract noun suffix -cy. Adequateness is from 1670s.
ardency (n.)
1540s, "warmth of feeling, desire," from ardent + -cy. A figurative sense, the literal meaning "intensity of heat" is attested from 1630s.
ascendancy (n.)
"dominant power or influence, state of being in the ascendant," 1712; see ascendant + -cy.
brilliancy (n.)
"quality of being brilliant," 1747; see brilliant + abstract noun suffix -cy. Also compare brilliance.