The best replacement for lymphocyte is leukocyte.

The best alternatives to lymphocyte are rated as following:
★★★★★  leukocyte
★★★★  lymphoblast
★★★  neutrophil
★★  plasma cell
★★  monocyte
★★  phagocyte
★★  white blood cell
★  basophil
★  b lymphocyte
★  absolute lymphocyte
★  macrophage
  lymphocyte
  t cell
  blast
  t lymphocyte
  myelocyte

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Speaking about lymphocyte, one probably shouldn't forget about high neutrophils.

Other search terms related to lymphocyte and their ratings are:
★★★★★ high neutrophils
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lymphocyte
leukocyte
lymphoblast