Apocryphal and deuterocanonical are not the same, although many term the deuterocanonical books apocryphal.

Apocrypha – Books that are not part of the canon. Not Scripture.

Deuterocanon – Books that part of the canon but, at one point, were disputed. Scripture.

The Gospel of Thomas is Apocrypha. Sirach is Deuterocanonical.

Deuterocanonical can be thought of in the same sense as Deuteronomy (second law). Deuteronomy is Law but came later (second). The Deuterocanon is Scripture but received full acceptance later (second).