Kenjutsu is less known than kendo.
It`s similar, but the differences are the focus and the variety of weapons and combat stances.
Kenjutsu is the original art of the sword in japan. Is more combat focussed. When japan was conquered and swords were forbidden, the japanese practiced kendo as a way to keep part of the tradition in a legal way, while some practiced kenjutsu in secret.
Kendo is sport focussed. It has less stances and i think they only use longsword.
About the aditional options kenjutsu has: They have more combat stances andcombat styles: Some options longsword, shortsword, 2 swords, naginata, 2 shortswords, kusari-gama and jo-jutsu(combat with a staff)
We start with longsword and a basic combat stance , but we expand to other weapons and combat stances as we increase in ranks.