No, a search doesn't do the same exactly as a concordance. It's a specialised dictionary that would have a definition for each entry (like a dictionary) but ALSO have a link to each verse were that particular meaning is used.
So one aspect can be be done poorly with search and one aspect done badly with a separate dictionary.
I just dug out Cruden's Concordance and a more modern one to check. So you'd not want a separate dictionary, that should be integrated to the concordance.
Some words have quite different meaning in a Bible to an ordinary dictionary. The Old Testament may use different words for the same thing or personal names (Joshua = Jesus, Mary = Miriam, James is not even in the Greek, I forget what it should be, that was a sop to King James). I've no idea about Spanish.
- The concordance needs the biblical dictionary included/integrated.
- It needs to connect OT and NT things that are spelled differently but actually the same.
- It needs phrase entries as well as single words.
- It needs to have separate entries for the same word / phrase that have completely separate usages. Links then to every verse.
- It need to be searchable in book and in ereader and be a top level with the Books of the Bible. Chapters then Level 2.
Some ereaders have issues with 3 levels and more in TOC, so only more headings textually in the "in book" Contents pages.