different between leaflessness vs leafless

English

leafless +? -ness

leaflessness (uncountable)

The property of being leafless.
The tree's leaflessness made it look scrawny, though in summer it seemed full and bushy.

From earlier leaveless, from Middle English leveles, equivalent to leaf +? -less.

leafless (not comparable)

Of plants or trees, without leaves.
In winter the leafless trees look cold.

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