"register" - key terms from Wikipedia

address register
aircraft register
annual register
base register
cash register
chest register
contents of specified index register
data register
debt of honour register
des moines register
destination register
electoral register
falsetto register
federal register
flags register
g register
general purpose register
gross register	tonnage
head register
index register
keeper of the register
listed on the national register
location register
modal register
mode register
national cash register
national register
national register	of historic places
naval vessel register
p register
processor register
register
register	indirect
register	key
register	machine
register	of historic places
register	of historic places listings
register	office
register	pair
register	tone
required to register
rule in the federal register
segment register
shift register
status register
upper register
victorian heritage register
vocal fry register
vocal register
whistle register