"register" - key terms from Wikipedia

address register
aircraft register
annual register
bank register
base register
cash register
contents of register
contents of specified base register
contents of specified index register
context register
death register
debt of honour register
des moines register
electoral register
falsetto register
federal register
flags register
g register
gross register	tonnage
head register
index register
issn register
keeper of the register
listed on the national register
modal register
national register
national register	of historic places
naval vessel register
p register
properties on the national register
register
register	file
register	indirect
register	key
register	machine
register	of historic places
register	of historic places listings
register	office
register	with the selective service
required to register
rule in the federal register
segment register
shift register
status register
supplementary register
tartan register
upper register
vocal fry register
vocal register
whistle register