Therbligs were the work of Frank and Lillian Gilbreth in their motion studies. The name Therblig is actually gilbreth spelled backwards with the th transposed.

A therblig is a name for a standardised set of motions which a worker has to perform in a manual task. You can find out more from the site linked.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern -H--B--G. That is, eight letter words with 2nd letter H and 5th letter B and 8th letter G. In alphabetical order, they are:

chibbing

therblig

thumbing

whizbang

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern T-E---IG. That is, eight letter words with 1st letter T and 3rd letter E and 7th letter I and 8th letter G. In alphabetical order, they are:

therblig

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 7 words with the pattern THE---I-. That is, eight letter words with 1st letter T and 2nd letter H and 3rd letter E and 7th letter I. In alphabetical order, they are:

theatric

theistic

thelitis

thematic

therblig

theremin

theurgic