Here is a little comparison from the NWT for the words meaning "apostacy":
In the OT, the Hebrew word is hanep (Strong's #26:11). Here are all its occurances:
Job 8:13; 13:16; 15:34; 17:8; 20:5; 27:8; 34:30; 36:13
Psa 35:16
Prv 11:9
Isa 9:17; 10:6; 33:14
Translated "apostate" in the NWT
In the NT, the Greek word is apostasia (Strong's # 646). It occurs in:
Act 21:21
2Th 2:3
Translated "apostacy" in the NWT
Also occurs in LXX at:
2Ch 29:19
Jer 29:32
The Theological Wordbook of the OT (TWOT, p.304) describes the use of the Hebrew word this way:
The adjective denotes a godless man, a man who forgets God (Job 8:13) and lives in opposition to all that is right (Job 17:8; Isa 9:17; 10:6). Of the thirteen times it is used , it appears eight times in Job, emphasizing the action and tragedy of the godless. . . . Association with the godless is a barren experience (Job 15:34). The godless have their pleasures but momentarily (never forever, Job 20:5). The godless should not hold govt. positions lest the people fall into a trap (Job 34:30). The man who forgets the fear of God is godless, a menace to society. He will be judged.
David demonstrates the upside-down character of the godless. Those who had turned against him were likened to the course jesting at godless banqueting tables (Ps 35:16)
Concerning the Greek word, BDAG defines it as:
"defiance of established system or authority, rebellion, abandonment, breach of faith.
AMG's Word Study Dictionary defines it as
"Departure, apostacy. . . In Acts 21:21 the new Christian believers among the Jews, having departed from Moses and coming to Jesus Christ, decided that they should stay apart from Moses, i.e. their Judaistic practices . . . In 2 Thess. 2:3 the word apostasia does not refer to genuine Christians who depart from the faith, but mere professors who, without divine grace, succumb to the Satanic deception of the Antichrist."
The New Strong's adds:
"In papyri documents it is used politically of rebels."
By comparison, the WT's use and definition of the word 'apostacy' produces effects like these:
John 7:13; 9:22; 12:42; 19:38; 20:19
The comparison of the WT with a hard line communist society, where speech and thought is highly censored, is quite apt.