The best replacement for helping verb is linking verb.

The best alternatives to helping verb are rated as following:
★★★★★  linking verb
★★★  main verb
★  linking verbs
★  adverb
★  auxiliary verb
  auxiliary
  linking

Your alternative for helping verb is not listed? Suggest!
Speaking about helping verb, one probably shouldn't forget about main verb.

Other search terms related to helping verb and their ratings are:
★★★★★ main verb
★★★★ past tense
simple predicate
action verb
irregular verb
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helping verb
linking verb
main verb