Ait vs Eyot - What's the difference?

Eyot is a synonym of ait.

is that ait is an island in a river, especially the River Thames in England while eyot is a little island, especially in a river or lake.

(wikipedia ait) (en noun)

An island in a river, especially the River Thames in England.

* R. Hodges (1649)

The ait where the osiers grew.

* 1833 , , Autobiography: Truth and Fiction Relating to My Life trans. John Oxenford, book 9,

Striking richness of vegetation which follows in the windings of the Rhine, marks its banks, islands, and aits .

* 1853 , , Bleak House , ch. 1,

Fog everywhere. Fog up the river, where it flows among green aits and meadows.

(Scotland) An oat.

(Burns)

* eyot

* * * ----

(en noun)

(chiefly, British) A little island, especially in a river or lake.