package bomb vs parcel bomb

package bomb and parcel bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
package bomb	Yes	No	No	No
parcel bomb	Yes	No	No	No

As nouns, package bomb and parcel bomb are synonyms defined as:

package bomb and parcel bomb: a thin explosive device inside an envelope or package and detonated when opened

Other synonyms of package bomb include letter bomb.

package bomb (noun)	parcel bomb (noun)
a thin explosive device inside an envelope or package and detonated when opened	a thin explosive device inside an envelope or package and detonated when opened