The best replacement for lymph node is cyst.

The best alternatives to lymph node are rated as following:
★★★★★  cyst
★★★  tumor
★★  pimple
★★  hernia
★★  lipoma
★★  muscle
★★  gland
★★  boil
★  thyroid nodule
★  ingrown hair
★  nodule
★  salivary gland
★  tendon
★  neck muscle
★  breast cancer
★  cancer
  thyroid
  muscle knot
  lymph gland
  spleen
  lump
  lymph nodule
  carotid artery
  breast lump
  pimple armpit

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Speaking about lymph node, one probably shouldn't forget about loss of fatty hilum.

Other search terms related to lymph node and their ratings are:
★★★★★ loss of fatty hilum
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