This word when it is known to be known as a verb then it has a wide range of meanings here. Wide range of meanings accompanied also with wide implications. This noun of interest normally it is used as part and parcel of a full sentence. In other words interest as a noun will not be used singularly because simply it has no meaning whatsoever for example one can say here I have interest in such and such. But a person cannot say only one word for interest as one word. A word similar to interest is actually a lost meaning for a word that has no interest in whatsoever here. Interest as such does have a plural meaning here because it will not be used only in a full sentence.

DR.HASHIM S.H. BEHBEHANI