The kernel is the central core of the computer's operating system, that has total control of all the activities of the computer. The kernel is a very small program in memory and runs first during the boot of the system. It is the interactive link between the hardware and operating system and other system softwares.
The uses a command line to receive and execute command for various system configurations like storage and memory mapping, enable and disable interrupts, set timers or allocate time slice to run programs etc.
Word is a word processing program. PowerPoint is presentation software. MS Word is used for preparing documents which have higher quantum of text and tables. ... On the other hand, MS Powerpoint is used in cases where you want to give a presentation.