List of 15-letter words beginning with

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There are 18 fifteen-letter words beginning with HA

HABITABLENESSES	• HABITABLENESS n. HABITABLE, that can be inhabited.
HAEMACYTOMETERS	• haemacytometers n. Plural of haemacytometer. • HAEMACYTOMETER n. an apparatus for counting the number of cells in a quantity of blood, typically consisting of a graduated pipette for drawing and diluting, also HEMACYTOMETER.
HAEMAGGLUTINATE	• haemagglutinate v. Alternative form of hemagglutinate. • HAEMAGGLUTINATE v. to cause the clumping of red blood cells in (a blood sample), also HEMAGGLUTINATE.
HAEMAGGLUTININS	• haemagglutinins n. Plural of haemagglutinin. • HAEMAGGLUTININ n. a virus, antibody or other agent causing haemagglutination, also HEMAGGLUTININ.
HAEMOCYTOMETERS	• haemocytometers n. Plural of haemocytometer. • HAEMOCYTOMETER n. an apparatus for counting the number of cells in a quantity of blood, typically consisting of a graduated pipette for drawing and diluting, also HEMOCYTOMETER.
HAEMOFLAGELLATE	• haemoflagellate n. Alternative form of hemoflagellate. • HAEMOFLAGELLATE n. a flagellate protozoan, such as a trypanosome, that is parasitic in the blood, also HEMOFLAGELLATE.
HAEMOGLOBINURIA	• haemoglobinuria n. (British spelling) Alternative spelling of hemoglobinuria. • HAEMOGLOBINURIA n. the presence of haemoglobin in the urine, also HEMOGLOBINURIA.
HAEMOGLOBINURIC	• haemoglobinuric adj. Alternative form of hemoglobinuric. • haemoglobinuric n. Alternative form of hemoglobinuric. • HAEMOGLOBINURIC adj. relating to the presence of haemoglobin in the urine, also HEMOGLOBINURIC.
HALFHEARTEDNESS	• halfheartedness n. The characteristic of being halfhearted. • half-heartedness n. Alternative form of halfheartedness. • HALFHEARTED n. lacking heart, spirit, or interest.
HALFPENNYWORTHS	• halfpennyworths n. Plural of halfpennyworth. • HALFPENNYWORTH n. as much as is sold for a halfpenny or is worth a halfpenny.
HALLUCINATIONAL	• hallucinational adj. Relating to hallucination. • HALLUCINATIONAL adj. of the nature of a hallucination.
HALLUCINOGENICS	• hallucinogenics n. Plural of hallucinogenic. • HALLUCINOGENIC n. a substance that induces hallucinations, also HALLUCINOGEN.
HAMAMELIDACEOUS	• hamamelidaceous adj. (Botany) Belonging to the Hamamelidaceae. • HAMAMELIDACEOUS adj. belonging to the witch-hazel family.
HAPHAZARDNESSES	• HAPHAZARDNESS n. HAPHAZARD, marked by lack of plan, order, or direction.
HARDHEARTEDNESS	• hardheartedness n. (Uncountable) The state of being hardhearted. • hardheartedness n. (Countable) A hardhearted thought or act. • hard-heartedness n. Alternative form of hardheartedness.
HARMONISTICALLY	• harmonistically adv. In a harmonistic manner. • HARMONISTIC adv. relating to harmony.
HARPSICHORDISTS	• harpsichordists n. Plural of harpsichordist. • HARPSICHORDIST n. one who plays the harpsichord.
HAZARDOUSNESSES	• HAZARDOUSNESS n. HAZARDOUS, dangerous.

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 WikWik.org and 1Word.ws.

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English Wiktionary: 278 words
Scrabble in French: 17 words
Scrabble in Spanish: 6 words
Scrabble in Italian: 7 words
Scrabble in German: no word
Scrabble in Romanian: 26 words

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