This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A usually abundant, luxuriant growth over or on something else: an overgrowth of ivy on the old house.

n. A usually abundant, luxuriant growth over or on something else. A tangle of growth occurring at the top of trees involving vines and branches, common in jungles.

n. An excessive growth or increase in numbers.

n. Excessive size; usually caused by over-production of growth hormone from the pituitary gland.

n. Excessive growth.

n. A growth that has covered somethin over.

n. A growth over or upon something else.

n. Exuberant or excessive growth.

n. The deposition of the crystals of one mineral species over those of another species, particularly when the individuals or subindividuals of the former have their orientation fixed by the latter; also one of the individuals or subindividuals so deposited.

n. a profusion of growth on or over something else

n. excessive size; usually caused by excessive secretion of growth hormone from the pituitary gland

"Then there are alternative health proponents who believe that candida overgrowth is common, even among apparently healthy people."

undergrowth   

profuseness    profusion    cornucopia    richness    hypertrophy   

hypertrophy    hyperplasia    gigantism   

rosebush    vaginosis    endotoxins    uvula    overheat    inoculum    lipopolysaccharide    cytology    tendril    thornbush