stroma

As nouns the difference between stroma and gran

is that stroma is the tissue structure of an organ, etc., that serves to support it while gran is a grandmother.

As a proper noun Stroma

is an island of the northern coast of Scotland.

As a proper noun stroma

is an island of the northern coast of scotland.

As a noun amnion is

(anatomy) the innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended.