(John 3:16) For God so loved the world, that he gave his only begotten Son, so that every man who believes in him would not
perish, but have eternal life.
Perish=Lost=ApollumiJesus came to restore lost things. Why is lost also translated as destroyed?
ἀπόλλυμι
apollumi
Thayer Definition:
1) to destroy
1a) to put out of the way entirely, abolish, put an end to ruin
1b) render useless
1c) to kill
1d) to declare that one must be put to death
1e) metaphorically to devote or give over to eternal misery in hell
1f) to perish, to be lost, ruined, destroyed
2) to destroy
2a) to lose
Part of Speech: verb
A Related Word by Thayer's/Strong's Number: from G575 and the base of
G3639Citing in TDNT: 1:394, 67
With a bit of selective reading

we see that the meaning is either lost or some sort of destruction that makes something lost.
(Matt 8:25) And the disciples having approached, they awoke him, saying, Save us, Lord, we are
perishing.
(Matt 8:26) And he says to them, Why are ye cowardly, O ye of little faith? Then after rising, he rebuked the winds and the sea, and there became a great calm.
Perish=Lost=Perish=ApollumiThey weren't afraid they got lost in the sense of no longer being able to find their way to the shore. Neither was their fear their bodies would be damaged/completly destroyed.
They simply were afraid to die. Losing their lives. Dying is losing life.
ὄλεθρος
olethrosThayer Definition:
1) ruin, destroy, death
1a) for the destruction of the flesh, said of the external ills and troubles by which the lusts of the flesh are subdued and destroyed
Part of Speech: noun masculine
A Related Word by Thayer's/Strong's Number: from a primary ollumi (to destroy, a prolonged form)
Citing in TDNT: 5:168, 681
Alternative redering here:
http://concordances.org/greek/3639.htm3639 ólethros (from ollymi/"destroy") – properly, ruination with its full, destructive results (LS). 3639 /ólethros ("ruination")
however does not imply "extinction" (annihilation). Rather it emphasizes the consequent loss that goes with the complete "undoing."(Luke 19:10) For the Son of man came to seek and to save that which was
lost.