What's the difference between with and withy?

With

Definition:

• (n.) See Withe.
• (prep.) With denotes or expresses some situation or relation of nearness, proximity, association, connection, or the like.
• (prep.) To denote a close or direct relation of opposition or hostility; -- equivalent to against.
• (prep.) To denote association in respect of situation or environment; hence, among; in the company of.
• (prep.) To denote a connection of friendship, support, alliance, assistance, countenance, etc.; hence, on the side of.
• (prep.) To denote the accomplishment of cause, means, instrument, etc; -- sometimes equivalent to by.
• (prep.) To denote association in thought, as for comparison or contrast.
• (prep.) To denote simultaneous happening, or immediate succession or consequence.
• (prep.) To denote having as a possession or an appendage; as, the firmament with its stars; a bride with a large fortune.

Example Sentences:

Withy

Definition:

• (n.) The osier willow (Salix viminalis). See Osier, n. (a).
• (n.) A withe. See Withe, 1.
• (a.) Made of withes; like a withe; flexible and tough; also, abounding in withes.

Example Sentences:

• (1) The use of photometrically equated targets well withi; the photopic levels is an improvement on present methods of colour perimetry.