Nanite

[Greta]

A nanomachine designed to build other nanomachines; a self-reproducing nanorobot.

[Rihanna]

[Geordie] slang for [goodnight]/nightnight most commonly used by [Jade Thirlwall]

[PussyCat]

Something that is very small but is a huge annoyance, or [bothersome]. Some small thing that keeps you from [reaching] a goal or from reaching [completion] of something.