access / excess
A way in versus an amount that is too much.
Access is the means or right of reaching something (access to the files; as a verb, access the records). Excess is a surplus or overabundance (an excess of caution; in excess of). Do not use excess when you mean entry, or access when you mean too much.
Examples
UseStudents need access to the lab.
UseAn excess of detail slowed the report.
AvoidStudents need excess to the lab.