The term 'guillotine targets' refers to the victims of the guillotine, a device used for executions during the French Revolution. The two crossword solutions for this term are TEES (4 letters) and TETES (5 letters). TEES is an abbreviation for têtes, the French word for heads, while TETES is the plural form of the same word. Thus, both solutions refer to the heads of those who were executed by the guillotine.