There are several possible words:
erection - construction, an edifice, or sexual tumescence
reaction - a response, or a chemical change taking place
rejection - being turned down
A Catalyst
sputnik is cool and groovy
Hugh g rection
Hugh g rection Amanda kiss
hugh e. rection
bubbles
Hugh G. Rection
its Hugh G. Rection
Hue G. Rection
"jacking off" by hugh g. rection
For example, thermal energy.
An unbalanced reaction equation.