different between wheatgrass vs lawngrass

English

wheat +? grass

wheatgrass (usually uncountable, plural wheatgrasses)

Young grass of the common wheat plant, Triticum aestivum, used freshly juiced or dried into powder for animal and human consumption.
A grass of the genus Agropyron, commonly known as crested-wheat grass.

lawn +? grass

lawngrass (countable and uncountable, plural lawngrasses)

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