פ \ ף Pe, the 17th letter, Gematria 80

פ is the 4th letter of the set of 5 that has a different final form ף, and it is also part of the BegadKepahat group of letters that have a secondary pronunciation. The secondary pronunciation of P is F, in both Modern Hebrew and Aramaic.

Like with Abraham/Avraham in the case of ב (Bet), one could find Semitic words imported into other languages spelled with either P or F, because the consonant is פ but the pronunciation is F.  E.g.  Yosep/Yosef. 

The word for Mouth in Modern Hebrew is פה (Pe). Fancy that one too.

ע Ayin - the 16th letter, Gematria 70

ע is a hard letter to pronounce for speakers of non-Semitic languages, if the Aramaic pronunciation is to be used.

Modern Hebrew has made it easy, by simply pronouncing it as א (Alef), when not immediately after a consonant or at the end of a word. In such cases, like א, it is silent in both Modern Hebrew and Aramaic. 

In Aramaic, ע is pronounced like an א (Alef) deeper in the throat and with the throat constricted, as if an invisible hand is choking you. It is pronounced as Arabic ﻉ (Ayin), usually the less rough version of it. Some Jewish people will still pronounce ע like in Aramaic, even in Modern Hebrew.

The word for Eye in both Modern Hebrew and Aramaic is עין (Ayin). Fancy that.

ס Samekh, the 15 letter with numeric value of 60

ס is pronounced as S in both Modern Hebrew and Aramaic.

The word for Horse in Hebrew is סוס (Sus) while in Aramaic is סוסא (Susa).

Note: In all the transliterations, the Latin not English transliteration is given.  As such the U in Sus is pronounced as Soos in English.

נ \ ן  Nun, 14th letter, numeric value 50

נ is the 3rd letter in the set of 5 that has a different form ן when found at the end of a word. It is pronounced exactly as N in many of the European languages like English, German, Italian, Romanian, etc. 

Pronunciation is the same N for both Modern Hebrew and Aramaic.

The word for I (Me) in Modern Hebrew is אני (Ani) while in Aramaic is אנא (Ana)

מ \ ם Mem - 13th letter, Gematria 40

מ is the second letter in the group of 5 letters which has a different ם form when it is found at the end of a word. מ is pronounced simply as M in Germanic or Latin based languages, with the same M pronunciation in both Modern Hebrew and Aramaic.

The word for water in Hebrew is מים (mayim). In Aramaic is מיא (maya)