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There are 20 twelve-letter words containing 2H, 2N and O

ANTHOXANTHINanthoxanthin n. (Biochemistry) Any of a group of water-soluble flavonoid pigments found in plants.
ANTHOXANTHIN n. a yellow pigment in plants.
ANTICHTHONESAntichthones n. (Geography) Those peoples who inhabit the antipodes, regions on opposite sides of the Earth.
ANTICHTHONES n. the antipodeans.
DIPHTHONGINGDIPHTHONG v. to pronounce as a diphthong.
HARMONIPHONEharmoniphone n. A free-reed musical instrument played with a keyboard, in which the sounds are produced by reeds set…
HARMONIPHONE n. a keyboard wind instrument with reeds, also HARMONIPHON.
HARMONIPHONSharmoniphons n. Plural of harmoniphon.
HARMONIPHON n. a keyboard wind instrument with reeds, also HARMONIPHONE.
HENCHPERSONShenchpersons n. Plural of henchperson.
HENCHPERSON n. a henchman or henchwoman.
HONEYBUNCHEShoneybunches n. Plural of honeybunch.
HONEYBUNCH n. (colloquial) a term of endearment.
HONEYMONTHEDHONEYMONTH v. (obsolete) to spend one's honeymoon, also HONEYMOON.
HYPHENATIONShyphenations n. Plural of hyphenation.
HYPHENATION n. the act of hyphenating.
HYPOXANTHINEhypoxanthine n. (Organic chemistry) A bicyclic heterocycle, 3,7-dihydropurin-6-one, that is an intermediate in the biosynthesis…
HYPOXANTHINE n. a purine base found in plant and animal tissues that yields xanthine on oxidation.
MONOPHTHONGSmonophthongs n. Plural of monophthong.
MONOPHTHONG n. two written vowels representing a single sound, e.g. 'oo', 'oa'.
NONCHURCHINGNONCHURCH v. to take away a church's status as a church.
NONPHOSPHATEnonphosphate n. (Chemistry) A substance that is not a phosphate.
NONPHOSPHATE adj. not phosphate.
NYCHTHEMERONnychthemeron n. A period of one day and one night, a date: in the West, this is a period of 24 consecutive hours.
NYCHTHEMERON n. (Greek) a full period of a day and night.
ONYCHOPHORANonychophoran n. (Zoology) Any of many wormlike carnivorous ecdysozoan animals of the phylum Onychophora.
ONYCHOPHORAN n. any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms.
PHONASTHENIAPHONASTHENIA n. weakness of voice.
PHYCOXANTHINphycoxanthin n. (Dated) A yellowish colouring matter found in certain algae.
PHYCOXANTHIN n. a yellow pigment found in diatoms, brown seaweeds etc.
RHINOPHONIASRHINOPHONIA n. a nasal tone to the voice which is caused by a defect in the nasal passages.
STROPHANTHINstrophanthin n. (Organic chemistry) Any of several poisonous cardiac glycosides obtained from various African plants.
STROPHANTHIN n. a very poisonous glucoside found in the seeds of the plant Strophanthus.
UNWITHHOLDENUNWITHHOLDEN adj. not withholden, also UNWITHHELD.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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