different between nulling vs bulling

English

nulling

nulling (countable and uncountable, plural nullings)

nulled work
- 2013, Charles H. Hayward, English Furniture at a Glance
  The legs are of the heavy bulbous type common at this time, turned in the cup and cover form, and carved with nullings and acanthus leafwork.

bulling

bulling (plural bullings)

The mating of a cow with a bull.
- 1865, British Farmer's Magazine (issue 48, page 8)
  Much difference of opinion exists as to the number of bullings a cow should receive. Here, I think, good judgment should be used. If the bull is cool and quiet, and some time has intervened since he had his last cow, one good leap is better than more […]
- 1874, The Farmer's Magazine (page 273)
  The herdsman left last autumn, and by his leaving the dates of service were lost, and the bullings of only a few cows could be given.

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