“Axes” is the plural of both ax and axis, and “bases” is the plural of both base and basis. Based on these observations, Willard Espy, in “A Plurality of Singular Verse”, Word Ways, Vol. 7, 1974, gave the following couple of short verses:
Paul Bunyan swung his ax, with view
To sundering the earth in two;
The ax that made that mighty probe
Stuck at the axis of the globe;
Pray tell, Larous, pray tell, Bowditch,
Of those two axes, which is which?
The base of a basis from the basis of a base
Is easy to distinguish in the singular case;
But the bases of bases I can’t define as yet;
The more I think about them the more I get upset.