thorium

As a noun thorium

is thorium.

As an adjective nonthorium is

not of or pertaining to thorium.

As a noun thorium

is thorium.

As an adjective organothorium is

(organic chemistry) describing any organic compound containing a carbon to thorium bond.

As nouns the difference between thorium and thorin

is that thorium is thorium while thorin is (chemistry) a highly toxic indicator used in the determination of barium, beryllium, lithium, uranium and thorium compounds.

As nouns the difference between thorium and yttrialite

is that thorium is thorium while yttrialite is (mineralogy) a rare, highly radioactive yttrium thorium sorosilicate mineral with conchoidal fracture.