I think {grid or grid lines} is the term you're looking for.
Grid lines.
bar chart
It is the vertical axis whereas the x axis is horizontal
They are almost same except directions, column chart are vertical type and bar chart are are horizontal.
bar chart/bar graph
x and y axis
Grid lines.
A bar chart usually consists of vertical bars but could also be horizontal.
bar chart
It is the vertical axis whereas the x axis is horizontal
They are almost same except directions, column chart are vertical type and bar chart are are horizontal.
Vertical bar chart: height Horizontal bar chart: length
The vertical axis of a graph/chart is the y axis, making the horizontal the x axis.
bar chart/bar graph
A scatter plot, a line chart, a bar chart are some possible answers.
grid lines
Graph