Collocations for dissertation - noun

research
doctoral, Master's, undergraduate (BrE)
MSc, PhD, etc.
15 000-word, etc.
unpublished

do, prepare, write
Students can either do a dissertation or take part in a practical project.

publish
complete, finish
present, submit
Candidates are required to present a dissertation of between 8 000 and 12 000 words.

defend

dissertation on
He wrote his Master's dissertation on rats.