Is the word crap a curse word?

Yes.

Other than a solemn invocation of a supernatural power to inflict harm, a 'curse' is any Word or phrase intended to be offensive, used to express anger or annoyance.

Many people find the Word crap offensive, and this is why it is used as an expletive.

Actually to my response i checked this wrong and the Word (crap) is not a curse Word.
Yes