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#Backstory

Many verbs undergo diphthongization in their conjugations when stressed syllables fall on historic vowels /ɛ/ /ɔ/ from Latin⁰.

  e.g.

#Question

Are there any other examples of verbs which have changed their form under the influence of a noun cognate? And if not, why did it happen with this verb?

  e.g.

• dezmar > diezmar (por inf. de diezmo)
• pensar > *piensar (por inf. de pienso³)
• contar > *cuentar (por inf. de cuento)

Note: I am not looking for instances of verbs which have diphthongs due to the Latin root having two neighbouring vowels e.g. orientar from Latin oriēns⁴.

##Extra info

Etymological history of relevant terms:

• Latin decem ("ten")
• Spanish diez ("ten")
• Latin decĭmus ("tenth")
  • Old Spanish diezmo ("tithe")
    • Spanish diezmo ("tithe")
  • Latin decimāre ("to decimate; to tithe")
    • Spanish dezmar ("to decimate; to tithe")
      • Spanish diezmar ("to decimate; to tithe")

Google Ngrams comparison of diezmar¹ and dezmar².

##Notes:

^{0. https://linguistics.stackexchange.com/a/20696/20700}

^{1. earliest example: 1728}

^{2. earliest example: 1610}

^{3. Meaning #2 - http://dle.rae.es/?id=SxBPv3A|SxCsyei}

^{4. Diccionario Crítico Etimológico Castellano E Hispánico, Joan Corominas}

EDIT: Creating a list of examples from the answers:

• dezmar, diezmar (diezmo)
• amoblar, amueblar (mueble)
• pontear, puentear (puente)
• festejar, fiestear (fiesta)
• cordelar, cuerdear (cuerda/cordel)
• -, afiebrarse (fiebre)

Extra:

• cerner, cernir
• hender, hendir
• ergir (yer-), ergir (ir-)
• http://conjugator.reverso.net/conjugation-verbs-with-double-participles-spanish.html
• Spanish Verbs Made Simple(r) - By David Brodsky (Search "alternative")

##Backstory

Many verbs undergo diphthongization in their conjugations when stressed syllables fall on historic vowels /ɛ/ /ɔ/ from Latin. e.g.

##Question

Are there any other examples of verbs which have changed their form under the influence of a noun cognate? And if not, why did it happen with this verb? e.g.

• dezmar > diezmar (por inf. de diezmo)
• pensar > *piensar (por inf. de pienso)
• contar > *cuentar (por inf. de cuento)

^{Note: I am not looking for instances of verbs which have diphthongs due to the Latin root having two neighbouring vowels e.g. orientar from Latin oriēns.}

^{Etymological history of relevant terms:}

^{Google Ngrams comparison of diezmar (earliest e.g. 1728) and dezmar (earliest e.g. 1610).}

^{4 Diccionario Crítico Etimológico Castellano E Hispánico, Joan Corominas}

• dezmar, diezmar (diezmo)
• amoblar, amueblar (mueble)
• pontear, puentear (puente)
• festejar, fiestear (fiesta)
• -, afiebrarse (fiebre)
• -, cuerdear (cuerda)

^{4. Diccionario Crítico Etimológico Castellano E Hispánico, Joan Corominas}

• dezmar, diezmar (diezmo)
• amoblar, amueblar (mueble)
• pontear, puentear (puente)
• festejar, fiestear (fiesta)
• cordelar, cuerdear (cuerda/cordel)
• -, afiebrarse (fiebre)