package vs encase

package is a noun but encase is not a noun.

Word	Noun	Adjective	Verb	Adverb
package	Yes	No	Yes	No
encase	No	No	Yes	No

As verbs, encase is a hypernym of package; that is, encase is a word with a broader meaning than package:

Other hypernyms of package include case, incase.

package (noun)	encase (noun)
a wrapped container
(computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory
a collection of things wrapped or boxed together

package (verb)	encase (verb)
put into a box	enclose in, or as if in, a case