lustre  - luster, shine, glory, distinction 

brillo  - luster, shine, brilliance 

glosa  - gloss, annotation, commentary 

explicación breve

glosar  - to gloss, to annotate, to comment on (a text) 

explicar  - to explain 

lustrar  - to shine, to polish 

pulir  - to polish, to shine, to refine, to perfect