'Bore cut' versus 'Plunge cut'?

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At the speed cutting competition at the local fairs when they had it I took a 2100 with a 16” bar and did 8 cuts in 17.5 seconds.
 
"Dave's top ten list"
#10)
....what he said
#9)
.... One goes in, one goes out
#8)
what the other guy said
#7)
people like to make **** up as they go
#6)
plunge is easier to comprehend & spell than excavating
#5)
it just depends on my mood.
#4)
it's all in the filing
#3)
plunge is a made up term that comes from the people that say "ful"l skip, "full" chisel and "full" wrap
#2)
one's for the log and ones for the lady but we're subject to change

....and Dave's # 1, top 10 list of
"What is the difference between plunge cut and bore cut

#1) I just thought one was 'American' and one was Canadian
 
'Thank you' for all who have replied. I am sticking with the 'different terms for the same thing' point of view.

Below, for anyone else with OCD, are some references I found that support the terms being used interchangeably.

Philbert

Glossary of Forest Engineering Terms
https://www.srs.fs.usda.gov/forestops/glossary/
Boring - Starting a cut in the center of a log using the tip of the saw blade. Also known as a plunge cut (24).
Plunge cut - Starting a cut in the center of a log using the tip of the chain saw blade. Also known as boring (24).
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STIHL MS 461 Instruction Manual
(pages 11 - 12, with illustrations) Similar language in other STIHL manuals.

Plunge cutting
- For felling leaners
- For relieving cuts during bucking
1. Begin cut by applying the lower portion of the guide bar nose – do not use upper portion because of – risk of kickback. Cut until depth of kerf is twice the width of the guide bar.
2. Swing saw slowly into plunge-cutting position – take care because of the risk of kickback or pushback.
3. Make the plunge cut very carefully. Danger of pushback.

Screen shot 2018-06-11 at 9.56.24 PM.png Screen shot 2018-06-11 at 9.56.35 PM.png
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Game of Logging Reference
https://web.extension.illinois.edu/...ng/UIUC_Tims_Tips_Chainsaw_Safety/backcut.pdf
" 2. The Bore Cut - Trees with backward or forward lean pose some difficulty and generally require the formation of a proper hinge prior to completing the back cut. On these trees it is recommended that the logger use the bore or plunge cut as the first step in making a back cut."
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Wildland Fire Chain Saws S-212 Student Workbook December 2012
National Interagency Fire Center,National Wildfire Coordinating Group (NWCG)

page 4A.14 Boring is a bucking method that can be used when space is limited under a log. You should gain proficiency with other bucking cuts first before attempting this cut.

page 4C.8 Boring to determine a tree’s soundness is an important technique, but it must be done properly because it has the potential for kickback. Using the guide bar nose, bore into the area 90 degrees to the holding wood (hinge).

page 4C.29 Two methods for removing leaners are a boring back cut and a triangle cut. You should gain experience before attempting these cuts.
 

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