solamente ella sabe
You could say "¿Quién sabe?"
nadie sabe
He knows only a little bit of spanish
Ella sabe leer.
"La sombra sabe"
He knows only a little bit of spanish
only = solamente
She says morte. Bella knows a bit of Spanish, so she knows it means death.
Same way you say it in English only you use a spanish tongue.
To say "I only speak French" in Spanish, you can say "Solo hablo francés."
Único or Única
If you want to say I smoked paprika (who knows it´s possible haha) you say "Fumé paprika" If you want to say smoked paprika you say "Paprika fumada" or if using in descibing a recipe for cooking you say "paprika ahumada"