fountain pen / filler
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fountain pen
A writing instrument that writes with liquid ink from a cartridge or a converter. The full name is Füllfederhalter.
In der Grundschule mussten wir alle mit einem Füller schreiben lernen.
In elementary school, we all had to learn to write with a fountain pen.
'Der Füller' is derived from the verb 'füllen' (to fill). This helps you understand both meanings: the pen is an object that you fill with ink, and filler content is something that fills a gap.
Bitte fülle die Flasche mit Wasser.
Please fill the bottle with water.
The context makes the meaning clear. If people are talking about school, writing, or office supplies, the pen is meant. If it is about media, packaging, or filling gaps, 'Füllinhalt' (filler content) is meant.
Ich brauche für meinen Füller neue Tintenpatronen.
I need new ink cartridges for my fountain pen.
'Füller' is the common short form for 'der Füllfederhalter' (fountain pen). In everyday life, the short form is almost always used.
Mein alter Füller aus der Schulzeit schreibt immer noch gut.
My old fountain pen from my school days still writes well.
In this meaning, the word often has a slightly negative connotation. It implies that the content is not especially important and only serves to fill space.
Das letzte Lied auf dem Album wirkt wie ein Füller.
The last song on the album feels like filler.
pen / pin / apprentice
'der Stift' and 'der Füller' can both be writing instruments. 'Stift' is the general term for many things you can write or draw with. 'Füller' is more specific and means a writing instrument with liquid ink and a nib. Learners may confuse the words because a 'Füller' can also count as a type of 'Stift' in everyday language. If the type of writing instrument does not matter, 'Stift' fits. If it is about writing with ink and a nib, 'Füller' is more precise.
In der Schule schreibt ihr die Überschrift mit dem Füller besonders sauber.
At school, you write the heading especially neatly with a fountain pen.
Nach dem Unterricht sucht meine Nachbarin einen Stift in ihrer Tasche.
After class, my neighbor looks for a pen in her bag.