Appropriate pair of words (synonyms) for beginning and end?

Question

I'm looking for a pair of words that describes the two ends of a metamorphosis/growth process but NOT the middle. I would prefer nouns.

I have currently "originality/finality". Other pairs include:
Genesis/Terminus
Potential/Realisation
Tyro/Master
Origin/Terminus
Alpha/Omega

The first word of the pair describes agency, ambition, trust, autonomy/will, initiative, industry.
The second word of the pair describes association, apodixis, identity, intimacy, integrity, closure.

Answer 1

beginning words: launch, initiation, enrollment, matriculate, matriculation

ending words: closure, success, maturity, graduation, culmination

Answer 2

The approprate pair are
alpha and omega. Unless you want like start and finish, head and tail, lead and finish.

Answer 3

start/finish
initial/terminal or initial/final
first/last
first place/last place (first/last)
opening/closing
birth/death
acorn/oak
primary (secondary, etc...goes up to vigenary, the 20th order)
foremost/hindmost