Answer:
The two words that were actually disappearing during Shakespeare's time, that he brought back, just for dramatic effect are:
1. "Swagger"
Williams Shakespeare quoting Henry V wrote, "...a rascal that swaggered with me last night ..." (Williams 4.7. 114 - 16).
2. "Champion" used as a verb:
In Macbeth 3.1.72 - 73, he also wrote, "...And champion me to ..."
Explanation:
There are many other English words like "bedroom," "noiseless," "well-bread," etc. that were, for the first time, joined together, used as verbs instead of nouns, and popularized by William Shakespeare, the acclaimed English playwright and wordsmith.