defiende, calificar, produjeron, clima, excitacion, calma
All those words are similar to English, and 5 out of 7 of them are in the dictionary. Have you tried looking any of them in the dictionary first'
This verb, "calificar" is the infinitive: [url=http://buscon.rae.es/draeI/SrvltConsulta'TIPO_BUS=3&LEMA=calificar]http://buscon.rae.es/draeI/SrvltConsulta'TIPO_BUS=3&LEMA=calificar[/url]
The infinitive for the second word is "producir". The model verb is: MORF. conjug. c. conducir. Produjeron is one of the past tenses called in Spanish Pretérito perfecto simple or Pretérito, which is used to express an action in the past which has no relationship to the present...it is completely past. But I think that the action is also completely finished rather than being one that, for example, may have happened habitually or over time or while something else was going on. Those cases would require a different form.
"Clima" is just a noun. You can look it up in the dictionary right here on SpanishDict.com.
The noun, "exitación" requires an accent over the "o" and can also be looked up here.
"Calma" is an adjective that can be looked up here, too.