nopal

As an adjective nodal

is of the nature of, or relating to, a node.

As a noun nopal is

a prickly pear cactus from the genus opuntia , especially.

As nouns the difference between nopal and opal

is that nopal is a prickly pear cactus from the genus Opuntia, especially species: Opuntia cochinellifera while opal is a mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.

As a proper noun Opal is

{{given name|female|from=English}} from the precious stone, invented in the nineteenth century.

As a noun nopal

is a prickly pear cactus from the genus opuntia , especially.

As an adjective notal is

of or pertaining to the back; dorsal.

As nouns the difference between nopal and copal

is that nopal is a prickly pear cactus from the genus Opuntia, especially species: Opuntia cochinellifera while copal is a resinous exudation from various tropical trees used chiefly in making varnishes and printing ink.