Grammar

இயன்நெறி (தொன்றமிழ்)
IyanNeri (Archaic Tamil, seen in Tholkaappiyam)

இலக்கணம்- Ilakkanam -is a false friend (from "Lakshana" -Sanskrit)

1.

English	ITRANS	Sanskrit	Meaning
L
lakshana	lakShaNa	l][	pointer; indicating or expressing indirectly; accurate description or definition.

(Cited from : http://www.advaita.org.uk/sanskrit/terms_lm.htm )

2. Lakshana (Sanskrit: लक्षण lakṣaṇa), derived from the combination of wordslakshya and kshana, means -'indication' or 'symptom',^[1] it also means – 'an auspicious mark', 'attribute' or 'quality' Grammatical implication

(Cited from: http://en.m.wikipedia.org/wiki/Lakshana)

Temple

Temple -  KOIL
from
Ko+il - ko (king/God) + il (home)

Temples were described in detail in Ancient Tamil Literature.
 Cilapatikaram and the Sangam poems such as Kaliththokai,Mullaippattu and Purananuru 
mention several kinds of temples such as 
* the Puranilaikkoattam or the temple at the outskirts of a city, 
* the Netunilaikkoattam or the tall temple, 
* the Palkunrakkottam the temple on top of a hill, 
* the Ilavantikaippalli or the temple with a garden and bathing ghat, 
* the Ezhunilaimaadam or a seven storeyed temple, 
* the Kadavutkadinakar or the temple city. (Source: Wikipedia- Religion, Tamil People)