In that case, yes, semantics.
L stance is 70/30 weight distribution, and:
View attachment 21530
Not sure how that relates to back stance, but the two look otherwise similar from an image search...
That to me is a knifehand - the 'tool' is the side of your open hand, from little finger (pinky?) to wrist.
A reverse knifehand is from index finger to wrist with you thumb tucked out of the way (is that ridge hand to others?)
Those are used to perform strikes or blocks.
"Straight fingertip" is what I think of when you say "spearhand" - mechanics like a 'normal' punch, but using the fingertips?
That's not used for a strike, but for a thrust (which is a kind of strike admittedly, but different...)
I don't recall seeing one in L (back) stance, but I'm intrigued enough to look now.
We have punches performed in L stance, so I would assume the mechanics would translate to a fingertip thrust?