In this sense, tadbhavas can be considered the native (inherited) vocabulary of modern Indo-Aryan languages.
Tadbhavas are distinguished from tatsamas, a term applied to words borrowed from Classical Sanskrit after the development of the Middle Indo-Aryan languages; tatsamas thus retain their Sanskrit form (at least in the orthographic form).
This can be compared to the use of borrowed Classical Latin vocabulary in modern Romance languages.
A second class of Sanskrit-derived words in modern Indo-Aryan languages covers words that have their origin in Classical Sanskrit and were originally borrowed into Prakrit or Apabhraṃśa as tatsamas but, over the course of time, changed in form to fit the phonology of the recipient language.
For example, reflexes of the Old Indo-Aryan word hṛdaya exist in Hindi both as a tatsama and as a tadbhava.