The term 'Instruction Unit' refers to a unit of instruction, which is a set of instructions or guidelines that are used to teach a particular skill or subject. The two crossword solutions for this term are 'STEP' (4 letters) and 'LESSON' (6 letters). STEP is a single action or movement that is part of a larger process, while a LESSON is a unit of instruction that is designed to teach a particular concept or skill. Together, these two words can be used to describe the Instruction Unit, which is a set of instructions or guidelines that are used to teach a particular skill or subject.