I can help, but I don’t currently have access to the exact tools needed to pull up fresh sources. If you’d like, I can still provide a concise overview based on general knowledge about the terms you listed and how they’re used in different contexts. Here’s a quick guide to each word and how they might relate in language learning or everyday usage:

• bed
  • Common meanings: a piece of furniture for sleeping; can refer to a bed frame, beds in different settings; in expressions, “bed” often appears in phrases like “bedtime,” “bedroom,” or “bed and breakfast.”
  • Language-learning note: basic vocabulary for beginners; easy to pair with verbs like lie, sleep, make the bed, go to bed.
• chem
  • Short for “chemistry,” a branch of science dealing with matter and its interactions.
  • Language-learning note: often appears in classroom contexts, lab safety phrases, and discussing scientific topics; useful to know terms like element, reaction, compound, atom, laboratory.
• letra
  • Spanish for “lyrics” or “letter” depending on context; in music contexts, it specifically means the song lyrics.
  • Language-learning note: handy for learners studying Spanish or Portuguese; can be used to talk about songs, translations, or letters in correspondence.

If your goal is translation practice, here are quick example translations in Spanish for the terms as standalone words:

• bed → cama
• chem → química
• letra → letra

Would you like a focused mini-lesson tying these terms to a specific language (e.g., English-Spanish or English-Portuguese) with example sentences, or a short exercise set to practice context usage? If you provide the target language and level, a tailored set can be prepared.