syncline

As a letter s

is the letter s with a.

As a noun syncline is

(geology) a concave-upward fold in rock strata.

As nouns the difference between syncline and null

is that syncline is (geology) a concave-upward fold in rock strata while null is zero, nil; the cardinal number before einn.

As nouns the difference between syncline and anticlines

is that syncline is (geology) a concave-upward fold in rock strata while anticlines is .

As nouns the difference between syncline and monoline

is that syncline is (geology) a concave-upward fold in rock strata while monoline is (business) a company operating in only one industry or line of business; often specifically a bank specializing in credit card issuance.

Syniform is likely misspelled.

Syniform has no English definition.

As a noun syncline

is a concave-upward fold in rock strata.

In geology|lang=en terms the difference between syncline and synclinorium

is that syncline is (geology) a concave-upward fold in rock strata while synclinorium is (geology) a large syncline with superimposed smaller folds.

As nouns the difference between syncline and synclinorium

is that syncline is (geology) a concave-upward fold in rock strata while synclinorium is (geology) a large syncline with superimposed smaller folds.

As nouns the difference between taxonomy and syncline

is that taxonomy is the science or the technique used to make a classification while syncline is a concave-upward fold in rock strata.

In geology terms the difference between syncline and downfold

is that syncline is a concave-upward fold in rock strata while downfold is a syncline.