English words are tremendous and immense. For non English-speakers, it is sometimes difficult to understand / remember them due to rare used in daily life. Here 10 sparse English words, which (maybe) you never know before.
1. A fortiori (a)
Used to express a conclusion for which there is stronger evidence than for a previously accepted one
Example:
The magistrate rejects all absolute ideas of justice, and a fortiori the natural-law position
2. Prow (n)
A The front of a ship or a boat above the water
B The portion of a ship’s bow above water
Example:
A With his hard nose protruding like a ship’s prow … he took to business as if it were war.
B The ship’s prow swung ponderously away from the Aurora Borealis, and her main thrusters fired to accelerate her away from the liner
Prow
3. Promulgate (v)
To make publicly known an idea
Example:
Galileo was in incarceration after promulgating about earthly science
4. Levee (n)
A An embankment made to prevent flooding
B A formal reception
Example:
A Construction of levees and embankments prevents the floodplain from performing this function and transfers the problem further downstream to areas which were not subject to flooding
B My manager and I would like you to be our guest at the levee tonight
Levee
5. Fissiparous (a)
Tending to break into parts
Example:
Alexandr ‘s unsuccessful in holding a fissiparous membership together
6. Dactyloscopy (n)
The analysis of fingerprints for identification of individuals
Example:
Doctor Bersani tries to introduce dactyloscopy into the police force, with prints from those arrested carefully classified
Dactyloscopy
7. Mayhap (a)
Perhaps, maybe
Example:
The idea of taking a vacation to Rome is mayhap acceptable
8. Ganef (n)
A thief
Example:
This ganef has stolen a lot of food from the Supermarket
Ganef
9. Vouchsafe (v)
To grant or give something as if as a favor / give or grant (something) to (someone) in a gracious or condescending manner
Example:
It is a blessing vouchsafed him by heaven
10. Loblolly (n)
A pine tree with long needles and strong wood
Example:
Dad has been building a loblolly house for about 2 months
Loblolly House
Loblolly Pine
My Unique Blog 
I am a native English speaker and I only knew 4 of those infrequent words.
That`s not bad 🙂
Nice to meet You Anthony