different between abutment vs abuttal

English

First attested in 1644; engineering sense first attested in 1793. From Old French aboutement. Equivalent to abut +? -ment.

abutment (countable and uncountable, plural abutments)

The point of junction between two things, in particular a support, that abuts. [First attested in the mid 17^th century.]
(engineering, architecture) The solid portion of a structure that supports the lateral pressure of an arch or vault. [First attested in the mid 18^th century.]
(engineering) A construction that supports the ends of a bridge; a structure that anchors the cables on a suspension bridge. [First attested in the mid 18^th century.]
(meteorology) The part of a valley or canyon wall against which a dam is constructed.
Heavy rains have caused the dam's abutments to seep, raising concern over possible dam failure.
Something that abuts, or on which something abuts. [First attested in the mid 18^th century.]
The state of abutting.
(architecture) That element that shares a common boundary or surface with its neighbor.
(dentistry) The tooth that supports a denture or bridge.
A fixed point or surface where resistance is obtained.
The fulcrum acted as an abutment.

abut +? -al

abuttal (plural abuttals)

(rare, plural only) The butting or boundary of land, particularly at the end; buttals. [First attested in the early 17^th century.]
(Can we find and add a quotation of Spelman to this entry?)
An abutment. [First attested in the early 17^th century.]
The act of abutting.