As nouns the difference between flower and grass

is that flower is a colorful, conspicuous structure associated with angiosperms, frequently scented and attracting various insects, and which may or may not be used for sexual reproduction while grass is any plant of the family Poaceae, characterized by leaves that arise from nodes in the stem and leaf bases that wrap around the stem, especially those grown as ground cover rather than for grain.

As verbs the difference between flower and grass

is that flower is to put forth blooms while grass is to lay out on the grass; to knock down (an opponent etc.).

As a proper noun Grass is

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