Neg
Negative
Negate, negligent
Neo/nov
New
Novel, neonatal
Noct,
Night
Nocturnal
Nom/nym
Name
Pseudonym, nominal
Non/not
Negative prefix
Nonfat, nonsense
Nounce
Call
Announce, pronounce
Nox/nec
Harmful
Noxious, necrosis
Ob
Against
Obstruct, obnoxious
Ology
Study of
Biology, theology
Omni
All, every
Omniscient, omnipresent
Ory
Place of
Observatory, directory
Pac/pax/plac
Peace, pleasing
Pacific, placid
Pan
All, everywhere
Pandamic
Par
Equal
Parity, partner
Para
Beyond, beside
Paranormal, paralegal