As nouns the difference between bondstone and boundstone
is that bondstone is a stone for bonding masonry to a similar backing while boundstone is a kind of calcareous rock sediment where the original components have been bound together after deposition.
bondstone
English
Noun
(
en noun)
A stone for bonding masonry to a similar backing.
boundstone
English
Noun
A kind of calcareous rock sediment where the original components have been bound together after deposition.