Save = Invest
Obviously NO,saving is when you dont want to risk the money in hand and just save, either be it for living or for any other needs of yours and investing is when you take risks in hope to increase the stash.
If you save bitcoin,
for a certain time and wait for bitcoin prices rose. I thought it was the safest investment
Yes,it is an investment cause you don't get bitcoin in free and you are investing fiat or the time which you could have used to earn money.Bitcoin is an investment but investing it again is a different story.